Critical Thinking Problem 9 C 1 Figure 9 31 shows a concrete dam Consider Case 1 without the sheet pile and Case 2 with the sheet pile along the upstream side a Draw flow nets for both cases b Determine the value of for both cases Note q m s m k m s c Determine the factor of safety FS against heaving using Eqs 9 23 9 24 and 9 24a for Cases 1 and 2 Comment on any differences in the magnitude of FS d Estimate the seepage force kN m at point A in the direction of seepage for Cases 1 and 2 Comment on any difference in the magnitude of the seepage force 9 m 3 5 m 0 45 m 1 m 2 26 m 4 75 m 2 49 m 4 Sheet pile A 1 3 5 m 1 m e 0 55 G 2 66 Rock Figure 9 31